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Assessment of Long-term Depression Induction in Adult Cerebellar Slices
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Cerebellar astrocytic alterations in depression.

Christa Hercher1,2, Gina Abajian1, Maria Antonietta Davoli1

  • 1McGill Group for Suicide Studies, Douglas Mental Health University Institute, McGill University, Montreal, Quebec, Canada.

Translational Psychiatry
|February 9, 2026
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Summary
This summary is machine-generated.

Depression alters cerebellar astrocytes, increasing their density in the Purkinje cell layer and reducing astrocytic connexins, particularly Cx43. This suggests widespread astrocyte dysfunction in the brain linked to depression.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Psychiatry

Background:

  • Cerebellar-cerebral circuit dysfunction is implicated in depression.
  • Cerebellar cellular and molecular alterations in depression are poorly understood.
  • Astrocyte dysregulation is observed in the cerebral cortex of depressed individuals.

Purpose of the Study:

  • To investigate alterations in cerebellar astrocytes and their communication in depression.
  • To quantify astrocyte subtypes and Purkinje cells in the cerebellum of depressed individuals.
  • To examine astrocytic connexin expression in the cerebellum.

Main Methods:

  • Quantification of glial fibrillary acidic protein (GFAP) and aldehyde Dehydrogenase-1 Family member L1 (ALDH1L1) positive astrocytes.
  • Analysis of Bergmann glia (BG), velate astrocytes, and fibrous astrocytes.
  • Single molecule in situ hybridization for connexin 30 (Cx30) and connexin 43 (Cx43) combined with immunolabeling.

Main Results:

  • Increased ALDH1L1+ astrocyte densities were observed in the Purkinje cell layer (PCL) of depressed individuals who died by suicide (DS).
  • Significant downregulation of astrocytic connexins, with marked reductions in Cx43, was found in the PCL and granule cell layer (GCL).
  • Purkinje cells (PCs) were quantified due to their association with BG.

Conclusions:

  • Bergmann glia (BG) in the PCL and velate astrocytes in the GCL are vulnerable in depression.
  • Astrocyte communication, specifically via connexins, is disrupted in the cerebellum of depressed individuals.
  • Findings suggest widespread astrocyte dysfunction across the brain in depression, extending beyond the cerebral cortex.